Hcg droppinng after MC?

So Im the one that got a positive a month after MC.

But on friday I had a hcg (3w7d) was at 52

And Monday (4w2d) hcg is at 22

I have no idea whats happening.

The midwife has no idea whats going on

Im getting sent for another blood test tomorrow and Im so lost on whats happening.

I still havent had my period its late by 1 week.